Wheel-rim and process of manufacturing the same



G. WARWICK. WHEEL mm AND PROCESS OF MANUFACTURING THE SAME.

APPUCATION FILED MAR. 24, I920- Patented Nov. 23, 1920.

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eiited cbftaimneiuand useful rYheel-Rims'and Processes of antifactiiringluthel;Saine ofwhich the ow ngis a'sn i ta i n- 'Thisin p2" nt gn s forjmprovements lll or r'eliitin fi tqiiltalivll el-nims having beaded iid the process of manufacturing the same, and has" for its object to provide a rim herein the over-turned edges shall be secured to the main bod of therim 1n 9. manneiphot heretofore a opted.

As is well known, the rims for pneumatic or'other tires have their margins folded over into the trough of the rim or on to the outer side of the rim, and the edges of these margins areusually brazed to the body of the run.

This brazing, by the commonly employed process jnecessitates heating the whole r m with the result that the temper of the rim is impgiiredand also scaling' occurs which necessiq q picklingi andpolishing after the rim hasbeen' braze By means'of the present invention, it is proposed to? produce runs whereof the edges of th overturned margins are secured to the body of the rim without having to heat up the whole rim and withontdestroying the smooth surface which the rim receives dur ing the shaping process in the rolls.

According to this invention, the over-' turned edges of the rim margimare secured to the body of the rim by electr cal brazrng or soldering in the manner described hereingutter and pointed out in the claims.

. By efle'ciiing the brazing or soldering by electrical ans,' the heating of-the rim can be restricted to theareas Where the brazing or soldering is to take efl'ect, and thus the generaltempr of the rim is not affected and the smoothness of the surface is not destrayed The invention is now further described with reference to the accompanying drawings, in which:---

Figure 1 is a perspective view of a portion of one form of rim, according tothis invention, and

Fig. 2 is a similar view of an alternative construction. g The construction shown in Fig. 1' comprises two edges A rolled to a shape constiwheel-rims of the kind UNITED STATES PATENT OFFICE f :jy-q q qg wn -g wrgx, snvnn KINGS, ENGLAND.

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tilting a well-known form of tubular head for tire rims and having two margins A 'jlaidover and upon the surface of the main body B of the rim. The two beaded edges 'are soldered or brazed to the-body alon their edges by O pieces C above and below the seam, so that the seam is heated by the electrical current )et'ween these contact-pieces, suitable pres sure being applied if necessary to hold the edgesof the margins on to the body. Either the Work is drawn past the contact-pieces or the contact-pieces are moved along the Work. A strip of brazing spelter D may be provided in each scam, or brazing spclter or solder, as may be desired, may be fed into the seams together with an appropriate flux.

In the alternative construction shown in Fig. 2. the body 13 of the rim is provided with shoulders as at B against which the edges of the margins A of the beads butt. It is, however, to-'-be understood that the two forms of rim body and the form of the bead shown in the examples illustrated are merely given by way of illustration and that this invention is applicable to any form of rim in which the edges are secured to a central band or body.

From the above it will be see-: that by effecting the brazing or solderim of the edges of the rim-margins to the body of the same by electrical means instead of by welding or other means at present adopted, the parts where the brazing or soldering is actually to be effected are suiliciently heated to bring about the required union Without the whole rim becoming so hot as to have the undesirable results stated.

What I claim as my invention and desire to secure by Letters Patent is 1. A process of. manufacturing metal described, comprising the steps of turning the margins of the, rim over to lie against the body of the rim to form two seams, electrically heating each seam thus formed to brazing temperature while maintaining the remainin parts of the rim at a materially lower temperature, and melting a brazing alloy in the seam while'thus heated, for the purpose and substantially as set forth.

2. A process of manufacturing metal wheel-rims of the kind described, comprising the steps of turning the margins of the rim over to lie against the body of the rim to form two seams, passing an electric carapplying electrical contactrent from one electrode to another situated on oYposite sides of one of said seams, and simu taneously producing a relative feed between the rim and the electrodes, the rate of feed and the intensity of the electric current being so ad'usted that only the said "'.'electrodes' on opposite s1 seam is heated to razin tem erature without melting the materia of t e rim at the jointpjijl ile the remaining parts of the rim areamaintained at a materially lower tem- Peratnre, Substantially as described. "$8. The method of manufaeturing metal wheel rims, comprising turning the margins of the rim inwardly to overlie the body of the rim'. to form seams dplacing overlyin es of one of sai seams, passin an electric current directly between said e ectrodes to produce a locally heated area only in that portion of the rim integral therewith whereof the over-turned edges of the margins of the wheel-rim are electrically hard-soldered to the metal body of the rim without melting an portion of the metal of the rim, and wit out heating any part 'of the rim other than the joints at the margins of the overturned rim to a temperature materially lower than the temperature at which hard soldering. iseflected, substantially as described.

In testimony whereof I GEORGE WARWICK.

afi'ix my signature. 

